Vitrified block.



heretof fren PATENT onirico',

` Lonrs sensoriales, or Fonfr'nononlowc VITRIFIED BLOCK.

messes.

-Be it known that I, LOUIS E. ARMSTRONG, e citizen of the United States, residing at Fort Dodge, in the county of Webster and State of Iowa, have invented certain-new and useful Improvements in Vitrified Blocks, of which the following is e specicntion.

My Ainvention reiates to vitrified blocks designed primarily for constructing sewers.

Blocks designed for sewer construction or similar purposes and which are placed beneath the ground' must be capable of resisting considerable pressure. In the making" 'may he readily' tired as d dried, and thusA produc-i g a strong and light structure.

'A further object of my invention is t0 improve 'the end `ioijnt senls between adjacent iiiotriis whereby the jgnt ends nre held in ma' rigidnnd .permanent Contact thun in n eronpenying drnwing-fF-igure 1 is an con View of n. seweror-eonduit formed o mj; homered blocks; 'a portionsthereof being shown in section. Fig. 2 isi-tml end view oi' my improved biock. Fig. l3 is a.

longitudinal scotionai view of one of my improved blocks and the meeting ends of ediecent .blocks Fig. 4 is av perspective i'iyiniprofed boeks.

.ig now more particularly to the my invention consists ofs block zi. op wall f3, n bottom 'wnii t?. end nod and truss walls 9 and 10 interen the op and-bottom walls 5 nu resi'eeetiv-iely, Iihe walls 9 und l@ di- Specification. of Letters Patent.' Pateyltcd Dec, 14,v 19.15, Application filed December 12, 1914. Seriell Ho. 876,775. I

verge from the top well 5 so as to form a truss Within'the block.

Eachfblock is made with o. rib 11 extend-l ing. along one side wall and a groove l2A along the other side Wall, adapted for'interlocking engagement with the rib 11 of an adjacent block. The top and bottomiw'alls are arched, while the end walls-converge-toward the bottom well.l The block is 'so formed that at one end the lowerwall 6 extends beyond the upper wall 5, while at the other end of the block, the lower w'gill is cut away as shown at13, whereby n shipjoint is obtained at the meeting Vends o adjacent blocks.

It is 'desirable to seal the ship-la joints with mortar, and to obtain n clench etween' the' mortar and the meeting ends"ofl adjecent blocks, I form flanges 14 aipon the xnj ner faces of the side walls 1l anlfl which. pro}ect toward the trusses- 9.' and .10' Vbut the ianges and trusses in .order that mortar may pass therebetween.- `Similnr finnge's'l are formed upon the trusses 9 and 10 which anges 14 and l5 are. disposed vslightly alici/e the bottom'wall of the block` and songe as vleave s sufficient space between-the ends/of surfaces around which the mortar muy form a clench and thereby mechanically lockthe meeting ends of adjacent blocks together.

Having now described my invention I claim:

1. `A vitritied block comprising top, bot-v tom and side walls, anfes formed integral with said side walls adjileentfthe bottom `wall and projecting inwardly toward each other but vnot connected, whereby a, mort-1r receiving -recess is formed between said flanges and 'bottom wall. Y

2.` A vitrified block comprising top, bottom and side walls, flanges formed integral with saidside walls and arranged in substnntially the same plane above said bottom wall, said flanges extendingr toward each other for a. relatively long distance and unsupported at their outer *,ends.

3. A vitrilied block comprising top, botl tom and side walls, a flange upon euch sido wall extending inwardly therefrom und `ar- '15' project inwardly -but do not meet. The

ranged substantially parallel to said bottom wall, said flanges being less in thickness than said side walls and unsupported at their outer ends.

' 4. A vitriied block comprising top, bottom and side walls, converging truss walls between said top and bottom Walls and flanges upon said end and truss walls arranged above said bottom wall, said flanges being unsupported at their outer ends and .ar- 10 ranged substantially parallel to said bottom Wall.

LOUIS E. ARMSTRONG. Witnesses:

D. B. NERSHAW, E. J. HEBMAN. 

